1,720,989 research outputs found
An Optimization Procedure for the Conceptual Analysis of Different Aerodynamic Configurations
No full textA preconditioned compressible flow solver for numerical simulation of 3D cavitation phenomena
No full textA numerical method for 3D barotropic flows in turbomachinery
No full textA numerical method for the simulation of 3D inviscid barotropic flows in rotating frames is presented. A barotropic state law incorporating a homogeneous-flow cavitation model is considered. The discretisation is based on a finite-volume formulation applicable to unstructured grids. A shock-capturing Roe-type upwind scheme is proposed for barotropic flows. The accuracy of the proposed method at low Mach numbers is ensured by ad-hoc preconditioning, preserving time consistency. An implicit time advancing only relying on the algebraic properties of the Roe flux function, and thus applicable to a variety of problems, is presented. The proposed numerical ingredients, already validated in a 1D context and applied to 3D non-rotating computations, are then applied to the 3D water flow around a typical turbopump inducer
The effect of the numerical scheme on the subgrid scale term in large-eddy simulation
No full textA priori tests are performed to study the effect of the filter on the subgrid scale term in large-eddy simulation. Several filters, corresponding to finite-difference schemes of different order of accuracy, are applied to direct numerical simulation data. In particular, the effect of the filter on the importance of the Leonard term and on its correlation with the subgrid scale stress is investigated to evaluate, for different numerical schemes, the capabilities of subgrid scale models accounting for this term, such as scale-similarity or mixed models
Application of a wavelet cross-correlation technique to the analysis of mixing
No full textThe wavelet cross-correlation analysis is applied to the time signals of scalar concentrations deriving from axisymmetric direct numerical simulations of a coaxial jet flow. Indications are established on the contribution of the roll up, passage, and pairing of vortical structures to Reynolds stress and to mixing between the two streams
Investigation on Mixing in a Coaxial Jet Configuration Through Axisymmetric Numerical Simulation
No full textAn Investigation on Mixing in a Coaxial Jet Configuration
No full textAtti del Dipartimento di Ingegneria Aerospaziale. ADIA 98-
Aerodynamic Design of High Performance Cars: Discussion and Examples on the Use of Optimization Procedures
No full textAnalysis of 2D Coupled Sails: Use of an Optimization Technique Based on Turbulent Viscous Flows
No full textA POD approach for turbulent flow control by electro-hydrodynamic large-scale structures
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